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\begin{document}

\title{The poisoning effect of K, Ca and Na on CeZrTiAl catalyst with nanosheet
skeleton structure}



\author[1]{Qianming Man}%
\author[2]{Pijun Gong}%
\author[1]{Yifei Jiang}%
\author[1]{Yulu Zhang}%
\author[1]{Ziqiang Chen}%
\author[1]{Ting Wei}%
\author[1]{Xumao Zhang}%
\affil[1]{Yantai University}%
\affil[2]{Affiliation not available}%


\vspace{-1em}



  
  \date{May 05, 2024}


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\selectlanguage{english}
\begin{abstract}
The poisoning effect of KNO3, NaNO3, and Ca(NO3)2 on CeZrTiAl catalyst
for selective catalytic reduction of NO with NH3 was investigated. It
was found that the activity deactivation rate follows K\textgreater{} Na
\textgreater{} Ca. SEM and BET showed that the accumulation of catalysts
was severe after poisoning, and the nanosheet \selectlanguage{greek}γ-\selectlanguage{english}Al2O3 skeleton structure
disappeared due to alkali coating. The decrease of the specific surface
area is accompanied by pore blockage, making the catalyst unable to
expose rich reaction sites. In addition, the fewer surface Ce3+ and
chemisorbed oxygen on the surface of the poisoned catalyst weaken the
cycle between Ce3+ and Ce4+, resulting in bad redox performance. Thus,
the failure to realize the efficient oxidation of NO to NO2. Another
critical reason for catalyst poisoning failure is that the decrease of
surface acid sites seriously affects the adsorption and activation of
NH3 and NOx on the catalyst surface.%
\end{abstract}%



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