Supporting MnAPO-5 molecular sieves on cordierite honeycomb monolith by vapor phase transport

MnAPO-5 molecular sieves/cordierite honeycomb monolith composite was prepared through supporting MnAPO-5 molecular sieves on cordierite honeycomb monolith by vapor phase transport. Effects of n(H₂O) : n(Al₂O₃), triethylamine(TEA) dosage, aluminum source, impregnation times and impregnation time on MnAPO-5 loading on the monolith were investigated. The products were characterized by means of XRD, SEM, and BET. When the monolith was impregnated in precursor solution with n(H₂O) : n(A1₂O₃) 100, the composite with about 70 μm thickness MnAPO-5 layer and good crystal form could be obtained. When the precursor solution with TEA was added, high crystalline MnAPO-5 could be synthesized. However, excessive TEA would lead to formation of MnAPO-34. It was found that the loading of MnAPO-5 on the monolith could be controlled by changing the impregnation times, not the impregnation time. The loading of MnAPO-5 with aluminum isopropoxide as aluminum source was more than that with pseudoboehmite as aluminum source.