Enhancement of hydrogen production performance of novel perovskite LaNi _{0 . 4} Al _{0 . 6} O _{3 ‐δ} supported on MOF A520 ‐

Abstract

Summary Methanol steam reforming (MSR) is a promising method for hydrogen production from renewable energy. The effect of λ‐Al2O3 support derived from metal‐organic frameworks (MOFs) aluminum fumarate (A520) on the performance and stability of LaNi0.4Al0.6O3‐δ for MSR is investigated. Results demonstrate that compared with LaNi0.4Al0.6O3‐δ, LaNi0.4Al0.6O3‐δ/λ‐Al2O3 can achieve complete conversion of methanol and excellent thermal stability due to the higher SBET and strong interaction between the metal components and λ‐Al2O3. Characterization results indicate that the LaNi0.4Al0.6O3‐δ/λ‐Al2O3 catalyst, which was not successfully reduced due to its robust structure, still has active sites for the MSR reaction. This characteristic of the catalyst has the potential to be applied for onboard in‐situ hydrogen production, because it can shorten the time of hydrogen reduction process. Furthermore, the effects of catalytic temperature, feed water‐methanol ratio, and liquid hourly space velocity on performance of LaNi0.4Al0.6O3‐δ/λ‐Al2O3 are studied in detail and the optimal conditions ​​are determined and applied for stability tests.

CuO‐modified LaNi0.4Al0.6O3−δ with improvement performance in MSR at low temperature

“…The detailed MSR experiments were introduced in our previous paper 14 . The MSR reaction was evaluated by the following equations: $$$$\begin{equation}{X}_{{\mathrm{methanol}}} = \left( {1 - \frac{{n_{{\mathrm{methanol}}}^{{\mathrm{out}}}}}{{n_{{\mathrm{methanol}}}^{{\mathrm{in}}}}}} \right) \times \ 100\% \end{equation}$$$$ $$$$\begin{equation}{Y}_{{{\mathrm{H}}}_2} = \frac{{{F}_{{{\mathrm{H}}}_2}}}{{n_{{\mathrm{methanol}}}^{{\mathrm{in}}}}}\end{equation}$$$$ $$$$\begin{equation}{S}_{{{\mathrm{H}}}_2} = \frac{{{F}_{{{\mathrm{H}}}_2}}}{{\left( {n_{{\mathrm{methanol}}}^{{\mathrm{in}}} - n_{{\mathrm{methanol}}}^{{\mathrm{out}}}} \right) \times \ 3}} \times \ 100\% \end{equation}$$$$ $$$$\begin{equation}{S}_i = \frac{{{F}_i}}{{{F}_{{\mathrm{CO}}} + {F}_{{\mathrm{CO}}_2} + {F}_{{{\mathrm{H}}}_2}}} \times \ 100\% \end{equation}$$$$ $$$$\begin{equation}{P}_{{{\mathrm{H}}}_2} = \frac{{{C}_{{{\mathrm{H}}}_2} \times {f}_{{\mathrm{products}}}}}{{{M}_{{\mathrm{cat}}} \times {{10}}^6}}\end{equation}$$$$where X methanol (%), $$…”

“…The detailed MSR experiments were introduced in our previous paper. 14 The MSR reaction was evaluated by the following equations:…”

“…The specific synthesis process of LaNi 0.4 Al 0.6 O 3−δ support was given in our previous study. 14 For CuO/LaNi 0.4 Al 0.6 O 3−δ , the specific preparation procedures are as follows: First, an appropriate amount of Cu(NO 3 ) 2 ⋅3H 2 O (calculated according to copper elements, the mass fraction of copper is 10%, 15%, and 20% of the support, respectively) is added to deionized water to prepare copper impregnating solution. The LaNi 0.4 Al 0.6 O 3−δ is then impregnated in a three-part copper nitrate solution.…”

Improved hydrogen production performance from methanol steam reforming by Ce‐doped CuO–Y2O3 catalysts

“…The samples were prepared by sol–gel method 17 . The metal salt precursors are Cu(NO 3 ) 2 ·3H 2 O, Ce(NO 3 ) 3 ·6H 2 O, and Y(NO 3 ) 3 ·6H 2 O, all of which are analytically pure.…”

“…The samples were prepared by sol-gel method. 17 The metal salt precursors are Cu(NO 3 ) 2 ⋅3H 2 O, Ce(NO 3 ) 3 ⋅6H 2 O, and Y(NO 3 ) 3 ⋅6H 2 O, all of which are analytically pure. In addition, ethylene diamine tetraacetic acid (EDTA) and citric acid are selected as complexing agents.…”