Abstract: Hβ zeolites were modified by hydrochloric acid. The crystal structure, textual properties and total acid content of the Hβ zeolites were characterized by XRD, N₂ adsorption and NH₃­TPD. Using thiophene as the probe molecule, the mass transfer behavior of Hβ zeolites modified by hydrochloric acid was studied by Frequency Response. The results showed that hydrochloric acid washed away the non skeleton aluminum which blocked the pore of zeolites, enhanced the permeability of molecular sieve pore and improved the mass transfer performance of the molecular sieve. In the frequency response spectrum, the response intensity of thiophene in the modified Hβ zeolites was obviously greater than that in the unmodified zeolite. The mass transfer performance of modified Hβ zeolites was improved, and the ability to adsorb thiophene was also enhanced obviously, which was significant for catalyzing thiophene reaction and optimizing industrial desulfurization.

Key words: Modification of hydrochloric acid, H&beta, zeolite, Frequency response, Mass transfer performance

摘要： 用盐酸溶液改性Hβ分子筛，采用XRD、N2吸附⁃脱附、NH3⁃TPD等手段对Hβ分子筛晶体结构、织构性质和酸量等进行表征，以噻吩为探针分子，采用频率响应技术研究了盐酸改性Hβ分子筛对其吸附扩散性能的影响。结果表明，盐酸改性Hβ分子筛后，溶解了堵塞在Hβ分子筛孔道内的非骨架铝，增强了分子筛孔道的贯通性，提高了分子筛的传质性能。在频率响应谱图中，噻吩在改性的Hβ分子筛中传质过程的响应强度明显大于在未改性的分子筛中传质过程的响应强度，盐酸改性后Hβ分子筛的传质性能得到了改善，吸附噻吩脱硫的能力明显增强，这对催化噻吩反应、优化工业脱硫具有重要意义。

关键词: 盐酸改性, Hβ分子筛, 频率响应, 传质性能