A series of Cu-Fe-Co based catalysts prepared by co-impregnation method using different alkali additives was characterized by BET, XRD and FESEM-EDX and investigated under MAS from CO hydrogenation. The results showed that the catalyst Cu25Fe22Co3-Na3/SiO2 has the highest catalytic activity and selectivity of total alcohol and C5+OH. XRD and FESEM-EDX demonstrated the Na3 catalyst exhibited homogeneous distribution of elements and effective synergy effect between Cu and Fe components, thereby performed good catalytic performances for MAS from CO hydrogenation. The presence of a suitable content of alkali promoter was necessary for mixed alcohols synthesis from syngas.

The K/Cu-Zn catalyst has been synthesized by the co-precipitation method coupling with impregnation method and the catalytic performances for the reverse water gas shift (RWGS) reaction and mixed alcohols synthesis from CO2 hydrogenation have been investigated. The catalytic activity and product distribution depend strongly on reaction temperature, pressure, space velocity and the molar ratio of H2/CO2. These results indicated that the optimal conditions for CO2 hydrogenation over K/Cu-Zn catalyst were as follows: 350 K, 6.0 MPa, 5000 h-1 and H2/CO2 = 3.0, under which the selectivity of CO and mixed alcohols reach 84.27 wt% and 7.56 wt%, respectively. The outstanding performances for RWGS reaction and mixed alcohols synthesis of K/Cu-Zn catalyst can be due to the well dispersion of Cu active component.

Supported metal particles are widely used as catalysts in industries but suffer from deactivation because of particle sintering. Here, an efficient and general strategy for the preparation of supported metallic particles with high resistance to sintering is demonstrated by a controllable topological transformation technique of layered double hydroxides (LDHs). This work focuses on the stabilization of CoGa particles developed by our group for catalytic conversion of syngas to alcohols. By the topological transformation of Co and Ga-containing LDHs in a reduction atmosphere, CoGa particles with diverse local structures/environments are produced. The dependence of local structures/environments for CoGa particles on the reduction conditions (temperature, temperature-programmed rate, or holding time) has been revealed. The sintering resistance of CoGa particles has been evaluated by the syngas conversion reaction. The catalytic stability is enhanced with the increase in the Ga0/Co0 ratio in CoGa particles and Ga/Co in bulk versus Ga/Co on the surface. Significantly, in addition to a trapped structure, the combination of alloyed Ga0 species and lattice GaIII connected to CoGa interfaces primarily contributes to promoting the sintering resistance.

Pyrolysis of high density polyethylene (HDPE) to polyethylene wax (PEW) in a 1 L continues stirred-tank reactor (CSTR) was studied at 360-420 °C with 5-240 min, yield of PEW was discussed and the properties such as the drop melting point and average molecular weight of wax were determined. The PEW had a melting point of 104-120 °C, and an average molecular weight of around 3000 with a good dispersity at 673 K. Moreover, the composition of wax determined by fourier transform infrared spectroscopy (FT-IR) indicated that it was less branched than commercial waxes.

The Ni-Pt/Ce0.7Zr0.3O2 catalysts were prepared by different impregnation methods. Study the properties of samples by XRD、TEM and H2-TPR etc. The results indicated that, bimetallic catalysts have better physico-chemical performance than monometallic catalysts, the loading of Pt and impregnation sequence has some effect on Ni-Pt bimetallic catalysts.