Synthesis, Stability, and Sulfation Properties of Sol−Gel-Derived Regenerative Sorbents for Flue Gas Desulfurization

Deng, Qiang

doi:10.1021/ie950399d

Cited by 33 publications

(32 citation statements)

References 24 publications

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“…The decrease is more obvious as the total weight percent increases from 40% to 90%. This finding is similar to that by Deng and Lin, 7 whose active species have a much smaller surface area. Such decrease in the surface area will lead to a sharp decrease in the adsorption capacity to be shown later.…”

Section: Resultssupporting

confidence: 90%

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Silane Removal at Ambient Temperature by Using Alumina-Supported Metal Oxide Adsorbents

Hsu

Tsai

Chiang

et al. 2007

Journal of the Air & Waste Management Association

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Copper, zinc, and cerium oxide adsorbents supported on alumina were used to remove silane gas (SiH 4 ). The adsorbents were prepared using a coprecipitation method and characterized by the inductively coupled plasma mass spectrometry, X-ray powder diffractometer, and Brunauer-Emmett-Teller method (BET). The silane removal efficiency and adsorption capacity of the adsorbents were investigated in this study. Test results showed that the adsorbents containing active species had a removal efficiency Ͼ99.9% for SiH 4 before breakthrough. Adsorbents containing mixed oxides (CuO-CeO 2 / Al 2 O 3 and CuO-ZnO/Al 2 O 3 ), which showed well-dispersed active species and high BET surface areas, had a greater adsorption capacity than the adsorbents containing single metal oxide. However, when the CuO-ZnO/ Al 2 O 3 adsorbents contain Ͼ40 wt% of active metal oxides, the increase of active species lowered the BET surface area leading to a decrease of the adsorption capacity. Additionally, when the content of the active metal oxides was between 20% and 40%, the CuO-ZnO/Al 2 O 3 adsorbents demonstrated higher adsorption capacity.

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Section: Resultssupporting

confidence: 90%

“…7,8 The preparation process of metal adsorbents is similar to that of metal catalysts, which requires high activity, sensitivity, and stability. The widely used preparation methods for metal catalysts are described with their merits and demerits by Pinna.…”

Section: Introductionmentioning

confidence: 99%

Silane Removal at Ambient Temperature by Using Alumina-Supported Metal Oxide Adsorbents

Hsu

Tsai

Chiang

et al. 2007

Journal of the Air & Waste Management Association

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“…Various CuO content in -Al2O3 were reported by previous researchers [6][7][8][9][10]. The effective CuO content on -Al2O3 was in the range of 4-8 % by mass [1,5,11], though more CuO could be impregnated [1,6,8,11]. Increasing CuO of course increase the sulfur loading of adsorbent CuO/-Al2O3.…”

Section: Introductionmentioning

confidence: 89%

Kinetic Study on the SO2 Adsorption using CuO/γ-Al2O3 Adsorbent

Bahrin

Subagjo

Susanto

2016

Bull. Chem. React. Eng. Catal.

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Adsorbent CuO/γ-Al2O3 for adsorption of SO2 were prepared by impregnating Cu(NO3)2.3H2O solution. Five types of adsorbent were obtained 5Cu (intended Cu concentration of 5%, actual of 4.92%, 8Cu (7.68%), 15Cu(14.13%), 22Cu (20.80%) and 27Cu (25.80%). For activity test, model gas containing SO2 with a concentration of about 0.757 mol.m -3 were passed through the bed of 1 gram adsorbent at a flow rate in the range of 1.4-1.8 mL.s -1 . Adsorption of SO2 were carried out at a constant temperature of 300, 350, 400 or 450 °C. Increasing sulfur loadings (gram of sulfur per gram of adsorbent) were observed with increasing adsorption temperatures, but not with increasing Cu content in the adsorbent. Among those types, adsorbent of 8Cu was considered as the best with respect to the sulfur loading (3.71 g of sulfur per 100 g of adsorbent). Adsorbent 5Cu had actually a better sulfur loading, but it was suspected being contributed also by adsorption of SO2 on γ-Al2O3. The shrinking core model was used in the kinetic study of adsorption using 8Cu and with additional assumption of a spherical particle. Compared to film diffusion and pore diffusion controlling step models, the reaction rate limitation was the best to fit the experimental data. The reaction rate constant for this model at temperatures of 300, 350, 400 and 450 °C were 0.015, 0.027, 0.030 and 0.042 kg.m.mol -1 .min -1 , respectively. The activation energy was 21.37 kJ.mol -1 and the frequency factor was 1.45 min -1 .

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“…According to the monolayer loading theory, copper supported on alumina was observed to be present not as crystalline CuO or CuAl 2 O 4 but as a less well-defined entity for roughly a monolayer coverage. 15 For copper loadings in excess of monolayer coverage of sorbent with CuO, crystalline CuO appears on the surface. 15 This indicated that the loading amount of CuO (<10 wt %) had dispersed well on the internal pore surface of the alumina support by the wetting impregnation method used here.…”

Section: Methodsmentioning

confidence: 99%

“…15 For copper loadings in excess of monolayer coverage of sorbent with CuO, crystalline CuO appears on the surface. 15 This indicated that the loading amount of CuO (<10 wt %) had dispersed well on the internal pore surface of the alumina support by the wetting impregnation method used here. Excessive CuO crystallized and was present on the external surface of the particles.…”

Section: Methodsmentioning

confidence: 99%

The Utilization of Catalyst Sorbent in Scrubbing Acid Gases from Incineration Flue Gas

Wey

Tseng

et al. 2002

Journal of the Air & Waste Management Association

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Catalyst sorbents based on alumina-supported CuO, CeO 2 , and CuO-CeO 2 were applied to a dry scrubber to clean up the SO 2 /HCl/NO simultaneously from pilot-scale fluidized-bed incineration flue gas. In the presence of organic compounds, CO and the submicron particles SO 2 and HCl removed by the fresh catalyst sorbents and NO reduced to N 2 by NH 3 under the catalysis of fresh and spent desulfurization/dechloridization (DeSO 2 /DeHCl) catalyst sorbents (copper compounds, Cu, CuO, and CuSO 4 ) were evaluated in this paper. The fresh and spent catalyst sorbents were characterized by the BrunnerEmmett-Teller method (BET), X-ray powder diffraction (XRPD), scanning electron microscopy (SEM), inductively coupled plasma-mass spectrometry (ICP-MS), and the elemental analyzer (EA).The study showed that the performances of CuO, CeO 2 , and CuO-CeO 2 /γ-Al 2 O 3 were better than that of Ca(OH) 2 . The removal efficiency of SO 2 and HCl was 80-95% in the dry scrubber system. Under NH 3 /NO = 1, NO could not be reduced to N 2 because it was difficult to control the ratio of air/fuel in the flue gas. For estimating the feasibility of regenerating the spent catalyst sorbents, BET and EA analyses were used. They indicated that the pore structures were nearly maintained and a small amount of carbon accumulated on their surface.

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Synthesis, Stability, and Sulfation Properties of Sol−Gel-Derived Regenerative Sorbents for Flue Gas Desulfurization

Cited by 33 publications

References 24 publications

Silane Removal at Ambient Temperature by Using Alumina-Supported Metal Oxide Adsorbents

Silane Removal at Ambient Temperature by Using Alumina-Supported Metal Oxide Adsorbents

Kinetic Study on the SO2 Adsorption using CuO/γ-Al2O3 Adsorbent

The Utilization of Catalyst Sorbent in Scrubbing Acid Gases from Incineration Flue Gas

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