Why I reject papers in journals?

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As a reviewer in several journals in the field of Catalysis, I have recommended rejecting nearly 80% of manuscripts (of about 30 papers), which was sent to me by the editors in the last two years. Most of the documents submitted were from universities in China. I do not know if this is a coincidence or because so many manuscripts were submitted from the Chinese university. However, I also found that the quality of some papers submitted from leading universities in Europe was low.

The following are the reasons why I do not accept manuscripts for publication:
Originality. Usually, in a paper that is not original, the results are straightforward to predict.
Speculation. Discussion and conclusion are not supported by the complete set of accurate data. Because of that, the jump into the conclusion statement was found in the manuscript.
Logic. The analytical technique used is not appropriate, nor logic in analyzing the data.