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result sql = Capture of gas-phase arsenic oxide by lime: kinetic and mechanistic studies.
Capture of gas-phase arsenic oxide by lime: kinetic and mechanistic studies.
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char = c;code = 99
char = u;code = 117
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char = e;code = 101
char = d;code = 100
char = ;code = 32
char = t;code = 116
char = o;code = 111
char = ;code = 32
char = b;code = 98
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char = ;code = 32
char = 5;code = 53
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char = m;code = 109
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char = ;code = 32
char = T;code = 84
char = h;code = 104
char = e;code = 101
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char = f;code = 102
char = f;code = 102
char = e;code = 101
char = c;code = 99
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char = ;code = 32
char = o;code = 111
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char = ;code = 32
char = i;code = 105
char = n;code = 110
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char = i;code = 105
char = a;code = 97
char = l;code = 108
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char = u;code = 117
char = r;code = 114
char = f;code = 102
char = a;code = 97
char = c;code = 99
char = e;code = 101
char = ;code = 32
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char = e;code = 101
char = a;code = 97
char = ;code = 32
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char = ;code = 32
char = C;code = 67
char = a;code = 97
char = O;code = 79
char = ;code = 32
char = s;code = 115
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char = e;code = 101
char = n;code = 110
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char = ;code = 32
char = s;code = 115
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char = u;code = 117
char = d;code = 100
char = i;code = 105
char = e;code = 101
char = d;code = 100
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char = ;code = 32
char = a;code = 97
char = ;code = 32
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char = f;code = 102
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char = ;code = 32
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char = e;code = 101
char = ;code = 32
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char = n;code = 110
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char = o;code = 111
char = d;code = 100
char = e;code = 101
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char = ;code = 32
char = T;code = 84
char = h;code = 104
char = e;code = 101
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char = e;code = 101
char = f;code = 102
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char = ;code = 32
char = o;code = 111
char = t;code = 116
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char = o;code = 111
char = r;code = 114
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char = a;code = 97
char = c;code = 99
char = i;code = 105
char = d;code = 100
char = i;code = 105
char = c;code = 99
char = ;code = 32
char = f;code = 102
char = l;code = 108
char = u;code = 117
char = e;code = 101
char = ;code = 32
char = g;code = 103
char = a;code = 97
char = s;code = 115
char = ;code = 32
char = s;code = 115
char = p;code = 112
char = e;code = 101
char = c;code = 99
char = i;code = 105
char = e;code = 101
char = s;code = 115
char = ;code = 32
char = (;code = 40
char = S;code = 83
char = O;code = 79
char = 2;code = 50
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char = a;code = 97
char = n;code = 110
char = d;code = 100
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char = H;code = 72
char = C;code = 67
char = l;code = 108
char = );code = 41
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char = n;code = 110
char = ;code = 32
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char = s;code = 115
char = e;code = 101
char = n;code = 110
char = i;code = 105
char = c;code = 99
char = ;code = 32
char = c;code = 99
char = a;code = 97
char = p;code = 112
char = t;code = 116
char = u;code = 117
char = r;code = 114
char = e;code = 101
char = ;code = 32
char = i;code = 105
char = s;code = 115
char = ;code = 32
char = f;code = 102
char = o;code = 111
char = u;code = 117
char = n;code = 110
char = d;code = 100
char = ;code = 32
char = t;code = 116
char = o;code = 111
char = ;code = 32
char = b;code = 98
char = e;code = 101
char = ;code = 32
char = m;code = 109
char = i;code = 105
char = n;code = 110
char = i;code = 105
char = m;code = 109
char = a;code = 97
char = l;code = 108
char = ;code = 32
char = u;code = 117
char = n;code = 110
char = d;code = 100
char = e;code = 101
char = r;code = 114
char = ;code = 32
char = t;code = 116
char = h;code = 104
char = e;code = 101
char = ;code = 32
char = c;code = 99
char = o;code = 111
char = n;code = 110
char = d;code = 100
char = i;code = 105
char = t;code = 116
char = i;code = 105
char = o;code = 111
char = n;code = 110
char = s;code = 115
char = ;code = 32
char = o;code = 111
char = f;code = 102
char = ;code = 32
char = t;code = 116
char = h;code = 104
char = e;code = 101
char = ;code = 32
char = e;code = 101
char = x;code = 120
char = p;code = 112
char = e;code = 101
char = r;code = 114
char = i;code = 105
char = m;code = 109
char = e;code = 101
char = n;code = 110
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char = .;code = 46
char = <;code = 60
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char = /;code = 47
char = >;code = 62
result sql = Trace metal emission from coal combustion is a major concern for coal-burning utilities. Toxic compounds such as arsenic species are difficult to control because of their high volatility. Mineral sorbents such as lime and hydrated lime have been shown to be effective in capturing arsenic from the gas phase over a wide temperature range. In this study, the mechanism of interaction between arsenic oxide (As2O3) and lime (CaO) is studied over the range of 300-1000 degrees C. The interaction between these two components is found to depend on the temperature; tricalcium orthoarsenate (Ca3As2O8) is found to be the product of the reaction below 600 degrees C, whereas dicalcium pyroarsenate (Ca2As2O7) is found to be the reaction product in the range of 700-900 degrees C. Maximum capture of arsenic oxide is found to occur in the range of 500-600 degrees C. At 500 degrees C, a high reactivity calcium carbonate is found to capture arsenic oxide by a combination of physical and chemical adsorption. Intrinsic kinetics of the reaction between calcium oxide and arsenic oxide in the medium-temperature range of 300-500 degrees C is studied in a differential bed flow-through reactor. Using the shrinking core model, the order of reaction with respect to arsenic oxide concentration is found to be about 1, and the activation energy is calculated to be 5.1 kcal/mol. The effect of initial surface area of CaO sorbent is studied over a range of 2.7-45 m2/g using the grain model. The effect of other major acidic flue gas species (SO2 and HCl) on arsenic capture is found to be minimal under the conditions of the experiment.

Publication: Environ. Sci. Technol. 2001 Feb 15 ;35(4)::794-9.
Publication Date: 2001 Feb 15
Study Author(s): Jadhav, R A;Fan, L S;
Institution: 121 Koffolt Laboratories, 140 West 19th Avenue, Department of Chemical Engineering, Ohio State University, Columbus, Ohio 43210, USA.
Shortcut link to this study:
Trace metal emission from coal combustion is a major concern for coal-burning utilities. Toxic compounds such as arsenic species are difficult to control because of their high volatility. Mineral sorbents such as lime and hydrated lime have been shown to be effective in capturing arsenic from the gas phase over a wide temperature range. In this study, the mechanism of interaction between arsenic oxide (As2O3) and lime (CaO) is studied over the range of 300-1000 degrees C. The interaction between these two components is found to depend on the temperature; tricalcium orthoarsenate (Ca3As2O8) is found to be the product of the reaction below 600 degrees C, whereas dicalcium pyroarsenate (Ca2As2O7) is found to be the reaction product in the range of 700-900 degrees C. Maximum capture of arsenic oxide is found to occur in the range of 500-600 degrees C. At 500 degrees C, a high reactivity calcium carbonate is found to capture arsenic oxide by a combination of physical and chemical adsorption. Intrinsic kinetics of the reaction between calcium oxide and arsenic oxide in the medium-temperature range of 300-500 degrees C is studied in a differential bed flow-through reactor. Using the shrinking core model, the order of reaction with respect to arsenic oxide concentration is found to be about 1, and the activation energy is calculated to be 5.1 kcal/mol. The effect of initial surface area of CaO sorbent is studied over a range of 2.7-45 m2/g using the grain model. The effect of other major acidic flue gas species (SO2 and HCl) on arsenic capture is found to be minimal under the conditions of the experiment.
PMID: 11349294

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