摘要
以吗啉为模板剂,基于原位水热法制了备Cu-SAPO-34催化剂,在催化剂评价装置上探究了的分子筛催化剂催化还原NO的能力。通过XRD、SEM、NH_(3)-TPD和H_(2)-TPR等分析手段测试了不同摩尔比的Si源量对Cu-SAPO-34的微观形貌、晶格结构和催化活性的影响。结果表明,Cu-SAPO-34分子筛颗粒的晶粒为均匀规整的立方结构,颗粒的尺寸在15~30μm之间,过量或过少的Si源摩尔比都会影响Cu-SAPO-34催化剂的结晶度。当温度在250℃时,Si源摩尔比为0.3的Cu-SAPO-34催化剂的脱硝活性达到了最大值86%;当温度超过300℃后,Cu-SAPO-34催化剂脱硝活性开始降低;当温度达到600℃时,Si源摩尔比为0.3的Cu-SAPO-34保持率达到81.4%,Cu-SAPO-34催化剂具有优异的耐高温性和宽的工作温度。总耗氢量随着Si源摩尔比的增大而先增大后减小,Si源摩尔比为0.3的Cu-SAPO-34催化剂总耗氢量达到最大值为415.61 mmol/g,总NH_(3)脱附量达到最高为1.56 mmol/g。综合可知,Si源摩尔比为0.3的Cu-SAPO-34具有最高的活性。
The Cu-SAPO-34 catalyst was prepared using morpholine as a template using in-situ hydrothermal method.The catalytic reduction ability of the molecular sieve catalyst for NO was investigated on the catalyst evaluation device.The effects of Si source amounts with different molar ratios on the microstructure,lattice structure and catalytic activity of Cu-SAPO-34 were tested using XRD,SEM,NH_(3)-TPD and H_(2)-TPR analysis methods.The results indicated that the grains of Cu-SAPO-34 molecular sieve particles had a uniform and regular cubic structure,with particle sizes ranging from 15 to 30μm.Excessive or insufficient Si source molar ratio could affect the crystallinity of Cu-SAPO-34 catalyst.At a temperature of 250℃,the denitrification activity of the Cu-SAPO-34 catalyst with a Si source molar ratio of 0.3 reached a maximum of 86%.When the temperature exceeded 300℃,the denitrification activity of Cu-SAPO-34 catalyst began to decrease.When the temperature reached 600℃,the retention rate of Cu-SAPO-34 with a Si source molar ratio of 0.3 reached 81.4%.The Cu-SAPO-34 catalyst had excellent high-temperature resistance and a wide operating temperature.The total hydrogen consumption first increased and then decreased with the increase of Si source molar ratio.The Cu-SAPO-34 catalyst with a Si source molar ratio of 0.3 had a maximum total hydrogen consumption of 415.61 mmol/g and a maximum total NH_(3) desorption of 1.56 mmol/g.Overall,Cu-SAPO-34 with a Si source molar ratio of 0.3 has the highest activity.
作者
律娅婧
苟丽媛
彭雨
LYU Yajing;GOU Liyuan;PENG Yu(School of Science,Xihua University,Chengdu 610039,China)
出处
《功能材料》
CAS
CSCD
北大核心
2023年第7期7165-7170,共6页
Journal of Functional Materials
基金
国家自然科学基金项目(21975208)
西华大学校级教改课题项目(xjjg2021039)。
