Pascal Atem, a native and citizen of Cameroon, petitions for review of an order of the Board of Immigration Appeals (BIA) affirming an Immigration Judge’s (IJ’s) denial of his application for asylum and withholding of removal, and for relief under the Convention Against Torture (CAT). On appeal, Atem argues that (1) the IJ erred in denying his application for asylum and withholding of removal because Atem provided credible testimony and evidence that he was persecuted in *72 Cameroon, and (2) it was more probable than not he would be tortured if he returns to Cameroon. After careful review of the record, we deny the petition.

The IJ rejected Atem’s asylum claim on the ground that his testimony about alleged persecution and other matters was not credible. We find that the IJ’s adverse credibility determination was supported by specific, cogent reasons for disbelief, and is thus entitled to deference. See Nyama v. Ashcroft, 357 F.3d 812, 817 (8th Cir. 2004) (per curiam) (deference standard); Loulou v. Ashcroft, 354 F.3d 706, 709-10 (8th Cir. 2003) (applicant was ineligible for asylum where testimony was not credible and she had not provided easily obtainable documentation to corroborate and support her claim). To the extent that Atem’s reference to torture is an attempt to revive his request for relief under the CAT, it is unavailing, as he did not raise the issue in his appeal to the BIA. See Afolayan v. INS, 219 F.3d 784, 788 (8th Cir. 2000). Finally, because we agree with the IJ’s decision as to asylum, we also uphold the IJ’s decision as to withholding of removal. See Francois v. INS, 283 F.3d 926, 932-33 (8th Cir. 2002) (standard for withholding of removal is more onerous than asylum standard).

Accordingly, we deny the petition.