吴撼明2,
王夫美1,
沈伯雄1
1.河北工业大学能源与环境工程学院，天津300401
2.中国汽车技术研究中心有限公司，天津 3004300
基金项目: 科技部重点研发专项资助（2018YFB0605101，2018YFB0605100）
天津市自然科学基金重点资助项目（18JCZDJC39800）
Preparation of Cu/SAPO-34/cordierite catalyst by improved one-step method and its denitration efficiency
BAI Pengfei1,,WU Hanming2,
WANG Fumei1,
SHEN Boxiong1
1.School of Energy and Environmental Engineering, Hebei University of Technology, Tianjin 300401, China
2.China Automotive Technology and Research Center , Tianjin300300, China
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摘要:采用改进一步法制备堇青石整体式Cu/SAPO-34分子筛催化剂，考察了涂覆工艺中黏结剂和分散剂对整体式催化剂性能的影响，以求获得最优添加剂量以达到较高整体式催化剂脱硝效率。研究结果表明，相比于传统一步法，改进一步法工艺简单，涂层更均匀。黏结剂的加入明显提高涂层强度，其中铝溶胶效果最好。铝溶胶降低催化剂活性，酸性硅溶胶提高催化剂低温活性，碱性硅溶胶提高催化剂高温活性。分散剂提高了催化剂涂层强度和脱硝效率。添加17%酸性硅溶胶量所制备的Cu/SAPO-34催化剂具有最好的NO转化率，在30 000 h-1空速下，NO转化效率在90%以上的温度窗口为200~425 ℃，起燃温度为150 ℃，且具有较好的涂层强度。实验结果证明改进一步法脱硝效果较好，且工艺简单节省能源，可以为整体式催化剂的生产制备工艺提供参考。
关键词: 选择催化还原（SCR）/
催化剂/
黏结剂/
分散剂/
改进一步涂覆法
Abstract:A cordierite monolithic Cu/SAPO-34 molecular sieve catalyst was prepared by an improved one-step method. The effects of binder and dispersant used in the coating process on the performance of the monolith catalyst were studied to determine the optimum additive amount for the high overall catalyst denitration efficiency. The results show that the improved one-step method is simpler with more uniform coating than the traditional one-step method. The binder addition significantly promoted the coating strength, and aluminum sol showed the best effects. Aluminum sol reduced the catalyst activity, acidic silica sol raised the catalyst activity at low temperature, and alkaline silica sol enhanced the catalyst activity at high temperature. The dispersant promoted the strength of the catalyst coating and the denitration efficiency. The Cu/SAPO-34 catalyst with addition of 17% acid silica sol presented the best conversion rate for NO. At 30 000 h-1 space velocity, the temperature window for above 90% NO conversion efficiency was 200~425 °C, the light-off temperature was 150 °C, a good coating strength was observed for this catalyst. The above experimental results proved that the improved one-step method had a good denitration performance, simple preparation and energy saving effect, which could provide a reference for the industrial preparation of the diesel monolithic catalysts.
Key words:selective catalyst reduction (SCR)/
catalyst/
binder/
dispersant/
improved one-step coating method.
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| [7] | XUE J J, WANG X Q, QI G S, et al.Characterization of copper species over Cu/SAPO-34 in selective catalytic reduction of NOx with ammonia: Relationships between active Cu sites and de-NOx performance at low temperature[J].Journal of Catalysis, 2013, 297(1):56-64 |
| [8] | MARTíNEZ-FRANCO R, MOLINER M, FRANCH C, et al.Rational direct synthesis methodology of very active and hydrothermally stable Cu-SAPO-34 molecular sieves for the SCR of NOx[J].Applied Catalysis B: Environmental, 2012, 127(17):273-280 10.1016/j.apcatb.2012.08.034 |
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改进一步法制备Cu/SAPO-34/堇青石催化剂及其脱硝效率
白鹏飞1,,吴撼明2,
王夫美1,
沈伯雄1
1.河北工业大学能源与环境工程学院，天津300401
2.中国汽车技术研究中心有限公司，天津 3004300
基金项目: 科技部重点研发专项资助（2018YFB0605101，2018YFB0605100） 天津市自然科学基金重点资助项目（18JCZDJC39800）
关键词: 选择催化还原（SCR）/
催化剂/
黏结剂/
分散剂/
改进一步涂覆法
摘要:采用改进一步法制备堇青石整体式Cu/SAPO-34分子筛催化剂，考察了涂覆工艺中黏结剂和分散剂对整体式催化剂性能的影响，以求获得最优添加剂量以达到较高整体式催化剂脱硝效率。研究结果表明，相比于传统一步法，改进一步法工艺简单，涂层更均匀。黏结剂的加入明显提高涂层强度，其中铝溶胶效果最好。铝溶胶降低催化剂活性，酸性硅溶胶提高催化剂低温活性，碱性硅溶胶提高催化剂高温活性。分散剂提高了催化剂涂层强度和脱硝效率。添加17%酸性硅溶胶量所制备的Cu/SAPO-34催化剂具有最好的NO转化率，在30 000 h-1空速下，NO转化效率在90%以上的温度窗口为200~425 ℃，起燃温度为150 ℃，且具有较好的涂层强度。实验结果证明改进一步法脱硝效果较好，且工艺简单节省能源，可以为整体式催化剂的生产制备工艺提供参考。
English Abstract
Preparation of Cu/SAPO-34/cordierite catalyst by improved one-step method and its denitration efficiency
BAI Pengfei1,,WU Hanming2,
WANG Fumei1,
SHEN Boxiong1
1.School of Energy and Environmental Engineering, Hebei University of Technology, Tianjin 300401, China
2.China Automotive Technology and Research Center , Tianjin300300, China
Keywords: selective catalyst reduction (SCR)/
catalyst/
binder/
dispersant/
improved one-step coating method
Abstract:A cordierite monolithic Cu/SAPO-34 molecular sieve catalyst was prepared by an improved one-step method. The effects of binder and dispersant used in the coating process on the performance of the monolith catalyst were studied to determine the optimum additive amount for the high overall catalyst denitration efficiency. The results show that the improved one-step method is simpler with more uniform coating than the traditional one-step method. The binder addition significantly promoted the coating strength, and aluminum sol showed the best effects. Aluminum sol reduced the catalyst activity, acidic silica sol raised the catalyst activity at low temperature, and alkaline silica sol enhanced the catalyst activity at high temperature. The dispersant promoted the strength of the catalyst coating and the denitration efficiency. The Cu/SAPO-34 catalyst with addition of 17% acid silica sol presented the best conversion rate for NO. At 30 000 h-1 space velocity, the temperature window for above 90% NO conversion efficiency was 200~425 °C, the light-off temperature was 150 °C, a good coating strength was observed for this catalyst. The above experimental results proved that the improved one-step method had a good denitration performance, simple preparation and energy saving effect, which could provide a reference for the industrial preparation of the diesel monolithic catalysts.
